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Quick Details

  • Place of Origin: Zhejiang, China (Mainland)
  • Brand Name: SOFTEL
  • Model Number: SR1001 RFoG
  • Optical AGC control range:: -7~+2 dBm
  • Operating frequency:: 45/87 ~ 862/1003MHz
  • Output optical wavelength:: 1310±10nm (or specified by the user)
  • Return frequency:: 5 ~ 65MHz (or specified by the user)
  • Input return loss:: ≥16dB
  • Operating temperature:: -20 ~ +55℃
  • Operating voltage:: DC +12V
  • Consumption:: ≤ 6W
  • Dimension:: 155mm(L)x116mm(W)x26mm(H)
  • Product name: Made in China Optical Receiver Module FTTH Node Satellite Receiver

Packaging & Delivery

Packaging Details: Standard export packing
Delivery Detail: 10 day
Product Description

 

Made in China Optical Receiver Module FTTH Node Satellite Receiver

 

1. Product Summary

SR1001-RFOG-ONU optical receiver is the bidirectional ONU equipment that is specially developed for HFC structure bidirectional metropolitan area broadband network. Rely on several years’ research experience for CATV HFC fiber transmitting equipment. Take full account of the FTTH (Fiber to the Home) network topology, the engineering technology problem of CATV bidirectional return channel noise collection and the high reliability network security transmission requirements of modern CATV business. The return path adopts the burst mode (open the laser when have return signal), which greatly reduced the noise collection.

 

 

 

 

2. Performance Characteristics

Laser control circuit adopts unique design, the work is reliable and stable.

Excellent AGC characteristic, when the input optical power range is -7~+2dBm, the output level remain unchanged, CTB and CSO basically unchanged.

Optimizing circuit design, SMT production process, optimizing the whole signal path, makes the photo-electronic signal transmission more stable, RF linear indicators higher.

Professional RF attenuator circuit, with good attenuation linear and high precision.

GaAs amplifier device, with good index, low distortion and high reliability.

The return path control adopts burst mode, which greatly reduced the noise collection.

The shell adopts aluminum die casting, cooling effect is good and the appearance is exquisite.

 

3. Technique Parameters

3.1 Link testing conditions

The performance parameters of this manual according to the measuring method of GY/T 194-2003 < Specifications and methods of measurement on optical node used in CATV systems >, and tested in the following conditions.

 

Test Condition:

1. Forward optical receive part: with 10km standard optical fiber, passive optical attenuator and standard optical transmitter composed the testing link. Set 59 PAL-D analog TV channel signal at range of 47/85MHz ~550MHz under the specified link loss. Transmit digital modulation signal at range of 550MHz ~862/1003MHz, the digital modulation signal level (in 8 MHz bandwidth) is 10dB lower than analog signal carrier level. When the input optical power of optical receiver is -1dBm, the RF output level is 92dBμV, measure the C/CTB, C/CSO and C/N.

 

2. Backward optical transmit part: Link flatness and NPR dynamic range are the link indexes which is composed of backward optical transmitter and backward optical receiver.

Note: When the rated output level is the system full configuration and the receiving optical power is -2dBm, equipment meets the maximum output level of link index. When the system configuration reduce (that is, actual transmission channels reduce), the output level of equipment will be increased.

 

Burst Mode (Select this mode, see below)

Optical Output Power

(Close the burst mode)

dBm

 -30

Laser Turn On Threshold

dBμV

≥70

Laser Turn Off Threshold

dBμV

≤62

Laser Turn On Time (t1)

us

0.5≤ t1 ≤1

Laser Turn Off Time (t2)

us

0.5≤ t2 ≤1.5

 

3.2 Technique Parameters

Item

Unit

Technique Parameters

SR1001-RFOG-ONU

Forward Optical Receive Part

Optical Parameters

Receiving Optical Power

dBm

-7 ~ +2

Suggested Use Range

dBm

-3 ~ +1

Optical Return Loss

dB

>45

Optical Receiving Wavelength

nm

1100 ~ 1600

Optical Connector Type

 

FC/APC, SC/APC (or specified by the user)

Optical Fiber Type

 

Single mode

Link Performance

C/N

dB

≥ 51 received optical power (-1dBm)

C/CTB

dB

≥ 68

C/CSO

dB

≥ 65

RF Parameters

Frequency Range

MHz

47/54/70/85~862(1003)

Flatness in Band

dB

±0.75

Rated Output Level

dBμV

≥ 92

Max Output Level

dBμV

≥ 92

Output Return Loss

dB

≥16

Output Impedance

Ω

75

Reverse Optical Transmit Part

Optical Parameters

Optical Transmit Wavelength

nm

1310±10, 1550±10 or specified by the user

Laser Type

 

DFB or FP laser

Optical Output Power

mW

0.5, 1, 2

Optical Connector Type

 

SC/APC (or specified by the user)

RF Parameters

Frequency Range

MHz

5 ~30/42/55/65, (or specified by the user)

Flatness in Band

dB

±0.75

Input Level

dBμV

75~85(Suggested input 80)

Input Return Loss

dB

≥ 16

Output Impedance

Ω

75

NPR dynamic range

dB

≥15 (NPR≥30 dB)

Use DFB laser

≥10 (NPR≥30 dB)

Use FP laser

General Performance

Power Voltage

V

DC12V

Operating Temperature

-30~+70

Storage Temperature

-30~+70

Relative Humidity

%

Max 95% no condensation

Consumption

W

≤6

Dimension

mm

154(L)* 116(W)* 26(H)

 

 

4. Block Diagram

 

SR1001 RFOG-ONU optical node block diagram:

 

 

5. Structure Diagram

 

 

1

Return path input test port

2

Forward path input test port

3

RF signal output, DC12V input, return path input

4

Grounding

5

Received optical power test point

6

Laser operating status indicator

7

Input optical power indicator (-7 displayed)

8

Power Indicator

9

Input optical signal

10

Output optical signal

11

DC12V input

 

 

 

 

6. Common Failure Analysis and Troubleshooting

 

Failure phenomenon

Failure cause

Solution

After connecting the

network, the image of the

optical contact point has

obvious netlike curve or

large particles highlights

but the image background

is clean.

1. The input optical power of the

optical receiver is too high, make the

output level of the optical receiver

module too high and RF signal index

deteriorate.

2. The RF signal (input the optical

transmitter) index is poor.

1. Check the input optical power and make

appropriate adjustments to make it in the

specified range; or adjust the attenuation of

optical receiver to reduce the output level and improve index.

2. Check the front end machine room optical

transmitter RF signal index and make

appropriate adjustments.

After connecting the

network, the image of the

optical contact point has

obvious noises.

1. The input optical power of the

optical receiver is not enough, result

the decrease of C/N.

2. The optical fiber active connector

or adapter of the optical receiver has

been polluted.

3. The RF signal level input the

optical transmitter is too low, make

modulation degree of the laser is not

enough.

4. The C/N index of system link

signal is too low.

1. Check the received optical power of the

optical contact point and make appropriate

adjustments to make it in the specified range.

2. Recover the received optical power of the

optical contact point by cleaning the optical

fiber connector or adapter etc methods.

Specific operation methods see “Clean and

maintenance method of the optical fiber

active connector”.

3. Check the RF signal level input the optical

transmitter and adjust to the required input

range. (When the input channels number less

than 15, should higher than nominal value.)

4. Use a spectrum analyzer to check the

system link C/N and make appropriate

adjustments. Make sure the system link signal

C/N>51dB.

After connecting the

network, the images of

several optical contact

points randomly appear

obvious noises or bright

traces.

The optical contact point has open

circuit signal interference or strong

interference signal intrusion.

1. Check if there is strong interference signal

source; change the optical contact point

location if possible to avoid the influence of

strong interference signal source.

2. Check the cable lines of the optical contact

point, if there is shielding net or situation that

the RF connector shielding effect is not good.

3. Tightly closed the equipment enclosure to

ensure the shielding effect; if possible add

shielding cover to the optical contact point

and reliable grounding.

After connecting the

network, the images of

several optical contact

points appear one or two

horizontal bright traces.

Power supply AC ripple interference

because of the bad earth of equipment

or power supply.

Check grounding situation of the equipment,

make sure that every equipment in the line

has been reliably grounding and the

grounding resistance<4Ω.

After connecting the

network, the received

optical power of the optical

contact point is unstable

and has large continuous

change. The output RF

signal is unstable, too. But

the detected output optical

power of the optical

transmitter is normal.

The optical fiber active connector

types do not match, maybe the APC

type connect to PC type, make the

optical signal cannot normal

transmission.

The optical fiber active connector or

adapter may be polluted seriously or

the adapter has been damaged.

1. Check the type of optical fiber active

connector and adopt the APC type optical

fiber active connector to ensure the normal

transmission of optical signal.

2. Clean the polluted optical fiber active

connector or adapter. Specific operation

methods see “Clean and maintenance method

of the optical fiber active connector”.

3. Replace the damaged adapter.

 

 

7. Clean and maintenance method of the optical fiber active connector
In many times, we consider the decline of the optical power as the equipment faults, but actually it may be caused by that the optical fiber connector was polluted by dust or dirt. Inspect the fiber connector, component, or bulkhead with a fiberscope. If the connector is dirty, clean it with a cleaning technique following these steps:
1. Turn off the device power supply and carefully pull off the optical fiber connector from the adapter.
2. Wash carefully with good quality lens wiping paper and medical absorbent alcohol cotton. If use the medical absorbent alcohol cotton, still need to wait 1~2 minutes after wash, let the connector surface dry in the air.
3. Cleaned optical connector should be connected to optical power meter to measure optical output power to affirm whether it has been cleaned up.
4. When connect the cleaned optical connector back to adapter, should notice to make force appropriate to avoid china tube in the adapter crack.
5. If the optical output power is not normal after cleaning, should pull off the adapter and clean the other connector. If the optical power still low after cleaning, the adapter may be polluted, clean it. (Note: Be carefully when pull off the adapter to avoid hurting inside fiber.)
6. Use compressed air or degrease alcohol cotton to wash the adapter carefully. When use compressed air, the muzzle aims at china tube of the adapter, clean the china tube with compressed air. When use degrease alcohol cotton, insert directions need be consistent, otherwise can’t reach a good clean effect.

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